chore: updated screenshots in README.md and added recent events (#17650)

* chore: updated screenshots in readme.md and added recent events

* chore: updated pinot superset connection instructions

* fixed outdated slack link

* addressed all outstanding feedback!

* updated package lock

* reverted package.json to master

* Update README.md

Co-authored-by: Evan Rusackas <evan@preset.io>

Co-authored-by: Evan Rusackas <evan@preset.io>

docs/src/components/footer.tsx

@@ -73,7 +73,7 @@ const LayoutFooter = () => (
     <div css={iconContainerStyle}>
       <div className="icons">
         <a
-          href="https://join.slack.com/t/apache-superset/shared_invite/zt-l5f5e0av-fyYu8tlfdqbMdz_sPLwUqQ"
+          href="https://join.slack.com/t/apache-superset/shared_invite/zt-uxbh5g36-AISUtHbzOXcu0BIj7kgUaw"
           target="_blank"
           rel="noreferrer"
         >